summary of arctas p-3 data flight #21 flown 7 jul 2008 phil russell, nasa ames with contributions...
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Summary ofARCTAS P-3 Data Flight #21
Flown 7 Jul 2008
Phil Russell, NASA Ameswith contributions from many, many
experimenters, modelers, forecasters, & P-3 air & flight crews
Postbrief/Science Meeting
3:00 Tue 8 Jul 2008
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AOD, 0Z,7/8
STEM Model prediction (U Iowa): July 7 P3 Flight
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GEOS5 Forecast: July 7 P3 Flight
Lots of aerosols in the Siberian fire/Asian anthro. Plume, including sulfate, dust, OC, & BC.
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GEOS5 Forecast: July 7 P3 Flight
No significant California fire or N. American pollution.
A strong Siberia fire/Asian anthropogenic plume between 7-10 km.Weak Siberia fire/Asian anthropogenic plumes between 1-6 km.
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P-3 in ARCTAS: PayloadAmes Airborne Tracking
Sunphotometer (AATS-14)
Solar Spectral Flux Radiometer (SSFR)
Broad-Band Radiometers (BBR)
LW SW
HiGEAR Aerosols & O3
OPC & DMA dry size dist, volatility Tandem Volatility DMA Neph scat + PSAP abs Humidified Neph f(RH) Ultrafine & CN Time of Flight Mass Spec size resolved chemistry SP2 black carbon mass
AERO3X Cloud Absorption Radiometer (CAR)
P-3 Data System (PDS): Nav, Flight, Met (P, T, RH, …) REVEAL & RTMM
AOD Ext H2O vapor
Cavity Ringdown ext (2) Reciprocal Neph sca (2, RH ) Radiance, BRDF
Flux↑,↓(), albedo()
Flux↑,↓, albedo
Nenes CCN PVM cloud drop reff, vol
TECO O3
COBALT: CO
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AOD, 0Z,7/8P3 Plan A Mon 7 Jul
Goals:1.Asian-Siberian plume above low cloud in A-Train footprints (in situ aer, CO, O3, rad gradient & stack, CAR cloud BRDF, CALIPSO val, aer effects on MODIS PM cloud retrievals)2.Ice Field BRDF3.Clear-sky work at WP 6 as fallback.
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P3 Plan B Mon 7 Jul
Goals:1.Asian-Siberian plume above Saturn Island AERONET (in situ aer, CO, O3 -AATS spiral, rad gradient & stack, CAR-AERONET)2.Ice Field BRDF3.Clear-sky work at WP 6 as fallback.
AOD = 0.49 on 6 Jul
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AOD, 0Z,7/8
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GEOS5 Forecast: July 7 P3 Flight - Clouds
Some middle and high clouds near Cold Lake.Close to Vancouver and Victoria island, some low clouds but no middle/high clouds.
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AOD, 0Z,7/8
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AOD, 0Z,7/8P3 Actual Mon 7 Jul
Accomplishments:1.Aerosol radiative forcing efficiency (F/AOT) under edge of advancing Asian/Siberian plume2.Aerosol effects on MODIS-Terra cloud remote sensing3.Tests of model aerosol, CO, & O3 predictions @ many locations4.Radiant flux divergence stacks for SSA() @ 2 locations5.CAR circles over AERONET for CAR-AERONET retrievals6.3-way closure (in situ, AATS, AERONET) in spiral
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04/21/2304/21/23 01:38 PM01:38 PM J. Redemann, P. Pilewskie, P. Russell. NASA Ames & U. ColoradoJ. Redemann, P. Pilewskie, P. Russell. NASA Ames & U. Colorado1212
Climate Change Science in INTEX-A/ICARTT Climate Change Science in INTEX-A/ICARTT Measurements of Aerosol Effects on the Measurements of Aerosol Effects on the
Solar Energy that Drives ClimateSolar Energy that Drives Climate
So
lar
ener
gy
[W m
So
lar
ener
gy
[W m
-2-2]]
Aerosol Amount, Aerosol Amount, AOD(499 nm)AOD(499 nm)
Jetstream 31 (J31)
Fo
rcin
g E
ffic
ien
cy [
W m
Fo
rcin
g E
ffic
ien
cy [
W m
-2-2]]
CaseCase
Slope =Aerosol Radiative Forcing Efficiency
Case 2,
21 Jul2004
Scientific Conclusions
1.The gradients (spatial variations) in AOD that occur frequently off the US East coast provide a natural laboratory for studying effects of aerosol particles on solar energy, and hence on climate.
2.For the average aerosol optical depth of ~0.5 in the 10 cases shown above, aerosols on average reduced the incident visible radiation (near midday) by the amount of energy it would take to power one 40 W light bulb for every square meter of ocean surface (0.5 x -80 W m-2 = -40 W m-2; see right frame above).
Redemann et al., Redemann et al., JGRJGR, 2006, 2006
Boreal Forest Fire Boreal Forest Fire Smoke Early in Smoke Early in INTEX-AINTEX-A
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AOD, 0Z,7/8P3 Actual Mon 7 Jul
Accomplishments:1.Aerosol radiative forcing efficiency (F/AOT) under edge of advancing Asian/Siberian plume2.Aerosol effects on MODIS-Terra cloud remote sensing3.Tests of model aerosol, CO, & O3 predictions @ many locations4.Radiant flux divergence stacks for SSA() @ 2 locations5.CAR circles over AERONET for CAR-AERONET retrievals6.3-way closure (in situ, AATS, AERONET) in spiral
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S. Howell et al., HiGEAR
PRELIMINARY
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AOD, 0Z,7/8P3 Actual Mon 7 Jul
Accomplishments:4. Radiant flux divergence stacks for SSA() @ 2 locations5. CAR circles over AERONET for CAR-AERONET retrievals6. 3-way closure (in situ, AATS, AERONET) in spiral
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Downwelling Flux: F
Upwelling Flux: F
Net Flux: F- F
Flux Divergence (absorption):
(F- F)2000m- (F- F)43m
Fractional absorption:
[(F- F)2000m- (F- F)43m]/ F2000m
2000 m
43 m
Background on Radiative Flux Divergence & Closure, Absorption Spectra, etc.
P. Russell, DOE-ASP Meeting, Annapolis, MD, 27 Feb 2008P. Russell, DOE-ASP Meeting, Annapolis, MD, 27 Feb 2008
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P. Russell, Earth Science Seminar, NASA Ames, 19 July 2007P. Russell, Earth Science Seminar, NASA Ames, 19 July 2007
Aerosol Aerosol AbsorptionAbsorption Optical Depth (AAOD) Spectra Optical Depth (AAOD) Spectra from 5 Experimentsfrom 5 Experiments
Wavelength, nm
Ab
so
rpti
on
Op
tica
l Dep
th
Bergstrom et al., ACP, 2007
AAOD = AAOD = K K -AAE-AAE
Absorption Absorption Angstrom Angstrom Exponent (AAE)Exponent (AAE)
AAE =AAE = 1.451.45
2.272.27
2.342.34
1.051.05
1.121.12
For Black For Black Carbon, AAE = 1Carbon, AAE = 1
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AOD, 0Z,7/8P3 Actual Mon 7 Jul
Accomplishments:4. Radiant flux divergence stacks for SSA() @ 2 locations5. CAR circles over AERONET for CAR-AERONET retrievals6. 3-way closure (in situ, AATS, AERONET) in spiral
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AOD, 0Z,7/8P3 Actual Mon 7 Jul
Accomplishments:4. Radiant flux divergence stacks for SSA() @ 2 locations5. CAR circles over AERONET for CAR-AERONET retrievals6. 3-way closure (in situ, AATS, AERONET) in spiral
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55
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The first half of the flight encountered a well-mixed local pollution layer up to ~2 km GPS altitude and a long-range transport air mass above, both homogenous over >200 km.
Julia
n D
ay U
TC
220
km
PRELIMINARY DATAfrom AATS & HiGEAR groups
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AOD at 550 nm between 500 – 6250 m GPS alt : 0.201
PRELIMINARY DATAfrom HiGEAR group
Clarke, McNaughton, Howell, Freitag et al.
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Missing layers at the top and bottom estimated by extrapolation, as illustrated in subsequent slides.
PRELIMINARYData from AATS, AERONET, & HiGEAR groups:
Redemann, Shinozuka, Livingston, Ramachandran et al.McArthur et al.
Clarke, McNaughton, Howell, Freitag et al.
Analysis by Yohei Shinozuka
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RH, 0Z,7/8 at 5.5 km
RH, 0Z,7/8 at 1.5 km
RH, 0Z,7/8 at 8.5 km
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Siberia biomass burning plume between 1-6 km + weak Asian anthropogenic pollution.
GEOS5 Forecast 20080707_06Z: July 7 P3 Flight
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AOD, 0Z,7/8
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AOD, 0Z,7/8
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AOD, 0Z,7/8
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AOD, 0Z,7/8
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AOD, 0Z,7/8
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P3 For July 7, 2007
Anthro lower
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AOD, 0Z,7/8P3 Actual Mon 7 Jul
Accomplishments:4. Radiant flux divergence stacks for SSA() @ 2 locations5. CAR circles over AERONET for CAR-AERONET retrievals6. 3-way closure (in situ, AATS, AERONET) in spiral
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AOD, 0Z,7/8P3 Actual Mon 7 Jul
Accomplishments:4. Radiant flux divergence stacks for SSA() @ 2 locations5. CAR circles over AERONET for CAR-AERONET retrievals6. 3-way closure (in situ, AATS, AERONET) in spiral
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